General Science - Physics
Welcome to General Science – Physics MCQ series of GKToday. As of today February 26, 2020, this series has 590 Questions. You may purchase a PDF E-Book compilation comprising all these questions and their answers with explanation from this link.
71. What is the splitting of light into its colours known as?
[A] Diffusion
[B] Dispersion
[C] Refraction
[D] None of the above
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Correct Answer: B [Dispersion]
Notes:
Splitting of light into its colours is known as dispersion of light. Rainbow is a natural phenomenon showing dispersion.
72. What is the work done to move a unit charge from point to another called as?
[A] Current
[B] Resistance
[C] Conductance
[D] Potential Difference
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Correct Answer: D [Potential Difference ]
Notes:
Work done to move a unit charge from one point to another is known as the electric potential difference between two points. Potential difference (V) = Work done (W)/Charge (Q) Volt is the SI unit of electric potential difference named after Alessandro Volta
73. Which of the following is true about the force between two point charges as per the Coulomb’s law?
[A] inversely as the square of the distance between the charges
[B] directly proportional to the product of the magnitude of the two charges
[C] Both a and b
[D] None of the above
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Correct Answer: C [Both a and b ]
Notes:
As per Coulomb’s law, the force between two point charges varied inversely as the square of the distance between the charges and was directly proportional to the product of the magnitude of the two charges and acted along the line joining the two charges.
74. What is the total charge of the electric dipole?
[A] 0
[B] -1
[C] +1
[D] None of the above
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Correct Answer: A [0 ]
Notes:
The total charge of the electric dipole is zero.
75. What do we call the rate at which electric energy is dissipated or consumed in an electric circuit?
[A] Conductance
[B] Power
[C] Resistance
[D] Potential Difference
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Correct Answer: B [Power ]
Notes:
Power is the rate at which electric energy is dissipated or consumed in an electric circuit.
76. What is the equivalent internal resistance of a series combination of n cells?
[A] the arithmetic mean of their internal resistance
[B] the product of their individual internal resistance
[C] the sum of their individual internal resistance
[D] the sum of the reciprocal of their individual internal resistance
Show Answer
Correct Answer: C [the sum of their individual internal resistance]
Notes:
The equivalent internal resistance of a series combination of n cells is just the sum of their internal resistances.
77. What do we call a device which generates electric energy using chemical energy?
[A] Potentiometer
[B] Resistor
[C] Cell
[D] Metre bridge
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Correct Answer: C [Cell]
Notes:
A device which generates electric energy using chemical energy is known as a cell.
78. What is the direction of current through electrolyte in a galvanic cell?
[A] flows from cathode to anode
[B] flows from anode to cathode
[C] flows in both direction
[D] None of the above
Show Answer
Correct Answer: B [flows from anode to cathode]
Notes:
Current flows from anode to cathode through electrolyte.
79. Which of the following is correct about magnetic field lines?
[A] Magnetic field lines are closed curves
[B] Degree of closeness of the field lines shows the strength of the magnetic field
[C] Both a and b
[D] None of the above
Show Answer
Correct Answer: C [Both a and b]
Notes:
The magnetic field lines are closed curves. The relative strength of the magnetic field is shown by the degree of closeness of the field lines.
80. Which of the following is NOT a natural magnet?
[A] lodestone
[B] pyrrhotite
[C] columbite
[D] titanium
Show Answer
Correct Answer: D [titanium]
Notes:
An example of a natural magnet is the lodestone, also called magnetite. Other examples are pyrrhotite, ferrite, and columbite.
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